JP2001237727A - Mobile radio receiver provided with integrated multi- address communication receiving circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To receive a multi-address communication signal by using the circuit element of a mobile communication terminal in common. SOLUTION: For simplifying a circuit structure which integrates the mobile radio receiver of a mobile communication terminal, a reception part where at least one constitution element is arranged to receive a multi-address communication signal is used. When control information for mobile communication is received, a processing for sure masking of a gap generated at receiving of multi-address communication is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a mobile communication device,
For example, it relates to a mobile radio receiver having an integrated broadcast receiving circuit.

[0002]

2. Description of the Related Art For example, DE 41 41 382 A1
An additional feature cordless telephone with several additional features such as a computer, a dictation device, a remote control, and a broadcast and / or television receiver is described. Elements provided for telephone functions, such as the numeric pad, function keys, and especially the power supply, must be shared between the telephone and the integrated additional functions.

In order to be fully useful, the mobile communication device must receive control information even when not in use, so that other parts of the mobile communication device, such as keys, displays, and power supplies are not required. Common use has not been successful so far in mobile communication devices.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to enable the common use of circuit elements of a mobile communication terminal for receiving broadcast signals.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to arrange at least one component of a receiving portion to receive a broadcast signal, and to receive the broadcast when control information for mobile communication is received. This is achieved by taking steps to mask the gaps that occur in

[0006] An advantage is that the components of the mobile radiotelephone receiver can also be used here for broadcast reception without leaving a gap in the reception of control information of interest to the listener. . In particular, when a digital signal processor (usually at any distance) is used to mask the gaps in the broadcast signal, the broadcast receiver and the mobile radiotelephone receiver receive parts can be connected to each other. The additional space required for the function of the broadcast receiver is smaller than when integrated side by side.

The invention will be explained in more detail below with reference to an embodiment shown in the drawings.

[0008]

FIG. 1 shows the basic concept of a receiver according to the present invention. As many components as possible of the receiving part 1 are commonly used for receiving mobile radio channels as well as radio stations. Further, the audio stage 2 and the digital signal processing device 3 perform processing for reproduction through the speaker 4 or the headset. During reception of the broadcast communication, the control device 5 switches the reception part to reception of the control channel of the mobile radio band at a predetermined time. During this time, the digital signal processing device 3 generates a substitute signal for masking a reception gap of a broadcast band caused by receiving the control information. For example, for this, the digital signal processor
It simply repeats the sequence received in the broadcast band before switching, for example, the last 20 ms of the received audio signal.

FIG. 2 shows GSM and DCS 18 in the VHF band.
1 shows a possible embodiment of the receiving part 1 of the multi-band radio device for broadcast signals 00 and 00. Most components of the receiving part are contained in the integrated circuit IC. The transmission portion is not used in the broadcast receiver and therefore does not form part of the present invention, and has been omitted for clarity. Other components well known to those skilled in the art, such as keyboards, display elements, and power supplies used in known manner for receiving mobile radio as well as receiving broadcasts are also omitted for this reason. I have.

[0010] The first antenna 6 and the first pre-filter 7 are arranged to receive the DCS 1800 band, while the second antenna 8 and the second pre-filter 9 receive the GSM band. In addition, the third antenna 10 and the third pre-filter 11
Arranged to receive HF broadcasts. The individual received signals are applied to individual mixing stages 15, 16, 17 via individual amplifiers 12, 13, 14. However, the mixing frequency is generated by a single oscillator 18. This oscillator 18 uses a PLL circuit and is common to all mixing stages and therefore common to all frequency bands. The PLL circuit of the present embodiment is a crystal oscillator 1 which is a crystal crystal externally connected to an integrated circuit IC.
9, automatic frequency control device 21, lock-in detector 22,
Sequential switching element 23, front counter 2
4, a programmable counter 25, a phase detector 26, a charge pump 27, a shift register 28, a station memory 29, and a low-pass filter 30 externally connected to an IC.

The concept of reception selected in the present embodiment is a concept of an intermediate frequency close to zero using an intermediate frequency lower than the reception frequency, for example, 100 KHz. The received frequency band is always supplied to a first automatic gain controller 31 and subsequently passes through a polyphase filter 32 for an intermediate frequency close to zero. After that, GSM and DCS1800
Is further received by a second automatic gain controller 33, a buffer amplifier 34, and an analog / digital converter 35.
On the other hand, a parallel processing branch with a third automatic gain controller 37 and a polyphase FM detector 38 is provided for the broadcast signal.

In general, the concept according to the invention provides, on the one hand, the common use of individual circuit elements of the receiving part for receiving the mobile radio band and the broadcast band, and, on the other hand, the common use of such circuit elements. A compromise must be found between the cost of being able to do so. In the above embodiment, the frequency in the case of the broadcast transmitter is not as stable as the frequency of the mobile radio transmitter, so the receiving frequency is readjusted to the fluctuating transmission frequency of the broadcast transmitter. So, for example, common PLL
Cost increases only in the circuit.

However, in the second embodiment, the integrated circuit (the Philips circuit OM5178 of this embodiment) is
It is fully used without modification for receiving broadcast signal bands. The only reason the PLL requires a lower reference clock is because the receive frequencies of the mobile radio band and the broadcast band are different. According to this concept of the invention, the GSM received signal and the broadcast received signal are separated by a separate antenna 4.
0, 42 and individual pre-filters 41, 43 and applied to the high frequency signal input of the integrated circuit IC via a first switch 45 and a first balun 46. In addition, separate externally controllable oscillators 47, 48 are provided for the GSM band and the broadcast band, which are included in the integrated circuit IC via an external PLL filter 49. Receiving respective control signals from the PLL switching circuit.
The output signal of the associated controllable oscillator is connected to the second switch 5
0 and is applied to the integrated circuit via a second balun 51. Further, the external oscillator 52
The output signal of the oscillator is applied via a frequency divider 53 adjustable by a digital signal processor DSP, since a lower reference frequency is required in the broadcast band. For example, stereo detection and RDS
All functions specific to broadcast reception, such as the detection of other functions included in the broadcast signal such as (Radio Data Signal, radio data signal), are performed by the digital signal processing device DSP or Baseband Audio.
o Interface (Baseband Audio Interface) Completely done in BAL. For example, an AFC signal that retunes the broadcast reception frequency to variations in the broadcast transmitter is generated at the baseband audio interface BAI and is a controllable oscillator used to adjust the broadcast reception frequency. 48 is applied to the second control input.

Of course, the frequency bands GSM and DCS
1800 is shown by way of example only. The invention can equally well be used for other reception bands, as long as control information needs to be received from time to time in the standby state.

[Brief description of the drawings]

FIG. 1 shows a circuit diagram of a receiver according to the invention.

FIG. 2 shows a first embodiment in which only certain circuit elements of the receiving stage are commonly used for mobile radio reception and broadcast reception.

FIG. 3 shows a second embodiment in which an integrated receiving stage is used completely for receiving mobile radio signals and broadcast signals.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Receiving part 2 Audio stage 3 Digital signal processing device 4 Speaker 5 Control device 6 First antenna 7 First pre-filter 8 Second antenna 9 Second pre-filter 10 Third antenna 11 Third front Pre-filter 12-14 Amplifier 15-17 Mixing stage 18 Oscillator 19 Crystal oscillator 21 Automatic frequency controller 22 Lock-in detector 23 Sequential switching element 24 Pre-counter 25 Programmable counter 26 Phase detector 27 Charge pump 28 Shift register 29 Station memory REFERENCE SIGNS LIST 30 low-pass filter 31 first automatic gain controller 32 polyphase filter 33 second automatic gain controller 34 buffer amplifier 35 analog-digital converter 37 third automatic gain controller 38 polyphase FM detector 40, 42 antenna 41, 43 Prefix Filter 45 first switch 46 first balun 47,48 externally controllable oscillator 49 external PLL filter 50 second switch 51 second balun 52 external oscillator

Continuation of front page (71) Applicant 590000248 Groenewoodseweg 1, 5621 BA Eindhoven, The Netherlands

Claims (5)

[Claims] 1. A mobile communication terminal, the mobile communication terminal further comprising a receiving part arranged to receive a broadcast signal, wherein the mobile communication control information is received when the mobile communication control information is received. A mobile communication terminal in which a gap generated in receiving a broadcast is masked. 2. The receiver according to claim 1, wherein said receiver is designed for the concept of an intermediate frequency close to zero.
A terminal device according to item 1. 3. The terminal according to claim 1, wherein the mobile radio reception signal and the broadcast reception signal are transmitted via a single intermediate filter. 4. The reception according to claim 1, wherein the mobile radio reception signal and the broadcast reception signal can be applied to the input of a reception stage via a controllable switch (41). apparatus. 5. The receiving device according to claim 1, wherein the already received and stored audio signal is repeated so as to mask the gaps occurring during the broadcast reception. .